Electronic Transport properties of ultra-thin BiFeO$_{3}$

ORAL

Abstract

We have investigated the electronic transport properties of rhombohedral (R) and the nearly-tetragonal (T) phase of BiFeO$_{3}$ using beyond density functional techniques, and combined with nanoscale I-V transport measurements. Using Quasi-particle GW approximation, we show the R and T phase to have significantly different electronic structures. We find that the T phase has significantly lower effective mass at the conduction band edge compared to the R phase leading to a lower effective barrier height for tunnel electrons (0.38 eV vs 3.6 eV). We therefore anticipate that tunnel devices with T phase BFO to have significantly lower resistances. Local transport measurements performed on ultra-thin BFO R phase are consistent with this inference. Tunneling measurements on the tetragonal phase films are also presented.

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Authors

  • Dipanjan Mazumdar

    • University of Alabama
    • Center for Materials for Information Technology, University of Alabama, Tuscaloosa, AL 35487

  • Oleg Mryasov

    • University of Alabama, Department of Physics
    • Center for Materials for Information Technology, University of Alabama, Tuscaloosa AL 35487

  • Vilas Shelke

    • Center for Materials for Information Technology, University of Alabama, Tuscaloosa AL 35487

  • Stephen Jesse

    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge Tennessee.

  • Art P. Baddorf

    • Oak Ridge National Laboratory
    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge Tennessee.
    • CNMS, Oak Ridge National Lab

  • Sergei Kalinin

    • Center for Nanophase Materials Scieces, Oak Ridge National Laboratory
    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge Tennessee.

  • Arunava Gupta

    • University of Alabama
    • Center for Materials for Information Technology, University of Alabama, Tuscaloosa, AL 35487
    • Center for Materials for Information Technology, University of Alabama, Tuscaloosa AL 35487